LTC4366 datasheet(27/32 Pages) AD

27 / 32 page

LTC7862

Rev 0

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APPLICATIONS INFORMATION

the pins of the IC. This capacitor helps to minimize the

effects of differential noise injection due to high frequency

capacitive coupling. If problems are encountered with

high current output loading at lower input voltages, look

for inductive coupling between CIN, the top MOSFET and

the bottom MOSFET to the sensitive current and voltage

sensing traces. In addition, investigate common ground

path voltage pickup between these components and the

GND pin of the IC.

An embarrassing problem, which can be missed in an

otherwise properly working switching regulator, results

when the current sensing leads are hooked up backwards.

The output voltage under this improper hookup will still

be maintained but the advantages of current mode control

will not be realized. Compensation of the voltage loop

will be much more sensitive to component selection. This

behavior can be investigated by temporarily shorting out

the current sensing resistor—don’t worry, the regulator

will still maintain control of the output voltage.

LTC4366 Datasheet(PDF) 27 Page - Analog Devices